Details, datasheet, quote on part number: LTC2485CDDPBF
PartLTC2485CDDPBF
Category
TitleIC ADC 24BIT I2C 10-DFN
Description

LTC’s LTC2485 combines a 24-bit plus sign No Latency ΔΣ™ analog-to-digital converter with patented Easy Drive technology and I2C digital interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and input signals, with rail-to-rail input range to be directly digitized while maintaining exceptional DC accuracy. This ADC includes an on-chip oscillator and can be configured through an I2C interface to reject line frequencies. The LTC2485 allows a wide common mode input range (0 V to VCC) independent of the reference voltage. The reference can be as low as 100 mV or can be tied directly to VCC. The ADC includes an on-chip trimmed oscillator eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset, and full-scale calibration. This device comes in 10-pin DFN package and has two temperature ranges to choose from: 0°C to +70°C and -40°C to +85°C. The LTC2485 is perfect for weight scales, test, and measurement applications.



CompanyLinear Technology Corporation
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Others parts numbering
LTC2485IDDPBF
DC956A: BOARD DELTA SIGMA ADC LTC2485

 

Features, Applications
FEATURES
LTC2485 24-Bit ADC with Easy Drive Input Current Cancellation and I2C Interface DESCRIPTION

The LTC2485 combines a 24-bit plus sign No Latency TM analog-to-digital converter with patented Easy Drive technology and I2C digital interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and input signals, with rail-torail input range to be directly digitized while maintaining exceptional DC accuracy. The LTC2485 includes on-chip temperature sensor and an oscillator. The LTC2485 can be configured through an I2C interface to measure an external signal or internal temperature sensor and reject line frequencies. 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well a 2x speed-up mode. The LTC2485 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low 100mV or can be tied directly to VCC. The LTC2485 includes an on-chip trimmed oscillator eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Easy DriveTM Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current Directly Digitizes High Impedance Sensors with Full Accuracy Integrated Temperature Sensor GND to VCC Input/Reference Common Mode Range 2-Wire I2C Interface Programmable 60Hz or Simultaneous 50Hz/60Hz Rejection Mode 2ppm (0.25LSB) INL, No Missing Codes 1ppm Offset and 15ppm Full-Scale Error Selectable 2x Speed Mode No Latency: Digital Filter Settles in a Single Cycle Single Supply to 5.5V Operation Internal Oscillator Six Addresses Available and One Global Address for Synchronization Available in a Tiny 3mm) 10-Lead DFN Package

APPLICATIONS

Direct Sensor Digitizer Weight Scales Direct Temperature Measurement Strain Gauge Transducers Instrumentation Industrial Process Control DVMs and Meters

Supply Voltage (VCC) to GND...................... to 6V Analog Input Voltage to GND....... 0.3V to (VCC + 0.3V) Reference Input Voltage to GND.. 0.3V to (VCC + 0.3V) Digital Input Voltage to GND....... 0.3V to (VCC + 0.3V) Digital Output Voltage to GND...... 0.3V to (VCC + 0.3V) Operating Temperature Range to 85C Storage Temperature Range.................. to 125C

DD PACKAGE s 3mm) PLASTIC DFN TJMAX = 43C/W EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB

LEAD FREE FINISH LTC2485CDD#PBF LTC2485IDD#PBF TAPE AND REEL LTC2485CDD#TRPBF LTC2485IDD#TRPBF PART MARKING* LBST PACKAGE DESCRIPTION 3mm) Plastic DFN 3mm) Plastic DFN TEMPERATURE RANGE to 85C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. (Notes 3, 4) PARAMETER

Resolution (No Missing Codes) Integral Nonlinearity Offset Error Offset Error Drift Positive Full-Scale Error Positive Full-Scale Error Drift Negative Full-Scale Error Negative Full-Scale Error Drift Total Unadjusted Error

0.1 VREF VCC, FS VIN +FS (Note 5) 5V VCC 5.5V, VREF = 5V, VIN(CM) = 2.5V (Note 6) 2.7V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6) 2.5V VREF VCC, GND IN+ = IN VCC (Note 13) 2.5V VREF VCC, GND IN+ = IN VCC 2.5V VREF VCC, IN+ = 0.75VREF, IN 0.25VREF 2.5V VREF VCC, IN+ = 0.75VREF, IN 0.25VREF 2.5V VREF VCC, IN = 0.75VREF, IN+ 0.25VREF 2.5V VREF VCC, IN = 0.75VREF, IN+ 0.25VREF 5V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6) 5V VCC 5.5V, VREF = 5V, VIN(CM) = 2.5V (Note 6) 2.7V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6) 5V VCC 5.5V, VREF = 5V, GND IN = IN+ VCC (Note = 27C

Bits ppm of VREF ppm of VREF V nV/C ppm of VREF ppm of VREF/C ppm of VREF ppm of VREF/C ppm of VREF ppm of VREF ppm of VREF VRMS mV mV/C

Output Noise Internal PTAT Signal Internal PTAT Temperature Coefficient

Resolution (No Missing Codes) Integral Nonlinearity Offset Error Offset Error Drift Positive Full-Scale Error Positive Full-Scale Error Drift Negative Full-Scale Error Negative Full-Scale Error Drift Output Noise

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. (Notes 3, 4) CONDITIONS

0.1 VREF VCC, FS VIN +FS (Note 5) 5V VCC 5.5V, VREF = 5V, VIN(CM) = 2.5V (Note 6) 2.7V VCC 5.5V, VREF = 2.5V, VIN(CM) = 1.25V (Note 6) 2.5V VREF VCC, GND IN+ = IN VCC (Note 13) 2.5V VREF VCC, GND IN+ = IN VCC 2.5V VREF VCC, IN+ = 0.75VREF, IN 0.25VREF 2.5V VREF VCC, IN+ = 0.75VREF, IN 0.25VREF 2.5V VREF VCC, IN = 0.75VREF, IN+ 0.25VREF 2.5V VREF VCC, IN = 0.75VREF, IN+ 0.25VREF 5V VCC 5.5V, VREF = 5V, GND IN = IN+ VCC

Bits ppm of VREF mV nV/C ppm of VREF ppm of VREF/C ppm of VREF ppm of VREF/C VRMS

PARAMETER Input Common Mode Rejection DC Input Common Mode Rejection 2% Input Common Mode Rejection 60Hz 2% Input Normal Mode Rejection 50Hz 2% Input Normal Mode Rejection 60Hz 2% Input Normal Mode Rejection 50Hz/60Hz 2% Reference Common Mode Rejection DC Power Supply Rejection DC Power Supply Rejection, 50Hz 2% Power Supply Rejection, 60Hz 2% CONDITIONS

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. (Notes 3, 4)

2.5V VREF VCC, GND IN = IN+ VCC (Note 5) 2.5V VREF VCC, GND IN = IN+ VCC (Note 5) 2.5V VREF VCC, GND IN = IN+ VCC (Note 5) 2.5V VREF VCC, GND IN = IN+ VCC (Notes 7) 2.5V VREF VCC, GND IN = IN+ VCC (Notes 8) 2.5V VREF VCC, GND IN = IN+ VCC (Notes 9) 2.5V VREF VCC, GND IN = IN+ VCC (Note 5) VREF = 2.5V, IN = IN+ = GND VREF = 2.5V, IN = IN+ = GND (Notes = 2.5V, IN = IN+ = GND (Notes 8, 9)

SYMBOL IN+ IN FS LSB VIN VREF PARAMETER Absolute/Common Mode IN+ Voltage Absolute/Common Mode IN Voltage Full-Scale of the Differential Input (IN+ IN) Least Significant Bit of the Output Code Input Differential Voltage Range (IN+ IN) Reference Voltage Range (REF+ REF)

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are = 25C. (Note 3)


 

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